V4L/DVB (13539): ir-common: add __func__ for debug messages

extern int media_ir_debug;    /* media_ir_debug level (0,1,2) */

#define IR_dprintk(level, fmt, arg...)	if (media_ir_debug >= level) \

	printk(KERN_DEBUG fmt , ## arg)

	printk(KERN_DEBUG "%s: " fmt , __func__, ## arg)

#define IR_TYPE_RC5     1

#define IR_TYPE_PD      2 /* Pulse distance encoded IR */